Preparation and Magnetic Properties of X-type Hexaferrites with Transition Metal Elements

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  • 遷移金属元素置換六方晶Ｘ型フェライトの作製および磁気特性
  • センイ キンゾク ゲンソ チカン 6ポウショウ Xガタ フェライト ノ サクセイ オヨビ ジキ トクセイ

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Abstract

The conventional synthesis of ferrite compounds consists of two-steps sintering processes. The first process is calcination to produce precursor of a desired ceramic object, and the second is to obtain the desired object.<BR>However, it was difficult to prepare X-type hexaferrite (Ba2Me2+2Fe28O46: Me2X, Me=Co, Ni, Cu, Zn) samples by this method. Two-steps sintering of these samples resulted in formation of spinel, M and W-type ferrite phases.<BR>We have found that Me2X can be obtained by a one-step sintering method that skipped the calcination process. When this method is applied, the temperature range of Me2X formation was very narrow and about 1250°C.<BR>We measured the saturation magnetization at 2 K and room temperature, and examined the Curie temperatures of Me2X samples produced by this method. These magnetic properties for Me2X samples relatively resemble those of MeFe2O4 spinel ferrites, which suggests that Me2+ cations are distributed in spinel blocks in the Me2X crystal structure.

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